Sloping walls on the bulk of the building create an optical illusion.大楼主体的斜墙给人造成一种视错觉。The camera combines rugged reliability with unequalled optical performance and speed.这款相机既坚固耐用，又有超凡的光学性能和快门速度。These optical fibres may...
I withheld payment until they had fulfilled the contract.他们履行合同后,我才付款.Names of the dead and injured are being withheld pending notification of relatives.在正式通知亲属前，伤亡人员名单暂时保密。The court overturned that decision on the groun...